Can you tell me the story of Cholkar and his vow to Sai Baba?

The story of Cholkar is a moving account of faith and divine omniscience. Cholkar was a man from a poor household whose job security depended on passing an examination. As detailed in Chapter 15, he made a vow to Sai Baba, promising that if he passed, he would travel to Shirdi and distribute sugar candy (khadisakhar) in Baba's name. As a mark of his commitment, he gave up sugar entirely until he could fulfill this promise. After passing, financial constraints, described as the difficult 'threshold-ghat' of home expenses, delayed his journey. When he finally reached Shirdi and fulfilled his vow, Baba demonstrated his knowledge of Cholkar's secret sacrifice. He instructed another devotee, Jog, to give Cholkar 'cups of tea, well-filled with sugar,' which brought tears of joy to Cholkar's eyes and solidified his faith.